Update LLVM for 3.5 rebase (r209712).

Change-Id: I149556c940fb7dc92d075273c87ff584f400941f
diff --git a/lib/Transforms/Scalar/ConstantProp.cpp b/lib/Transforms/Scalar/ConstantProp.cpp
index 7045b36..dd51ce1 100644
--- a/lib/Transforms/Scalar/ConstantProp.cpp
+++ b/lib/Transforms/Scalar/ConstantProp.cpp
@@ -18,7 +18,6 @@
 //
 //===----------------------------------------------------------------------===//
 
-#define DEBUG_TYPE "constprop"
 #include "llvm/Transforms/Scalar.h"
 #include "llvm/ADT/Statistic.h"
 #include "llvm/Analysis/ConstantFolding.h"
@@ -31,6 +30,8 @@
 #include <set>
 using namespace llvm;
 
+#define DEBUG_TYPE "constprop"
+
 STATISTIC(NumInstKilled, "Number of instructions killed");
 
 namespace {
@@ -68,7 +69,7 @@
   }
   bool Changed = false;
   DataLayoutPass *DLP = getAnalysisIfAvailable<DataLayoutPass>();
-  const DataLayout *DL = DLP ? &DLP->getDataLayout() : 0;
+  const DataLayout *DL = DLP ? &DLP->getDataLayout() : nullptr;
   TargetLibraryInfo *TLI = &getAnalysis<TargetLibraryInfo>();
 
   while (!WorkList.empty()) {